What name did Beyoncé use for her alter ego during the 2008 album era?

Beyoncé used the name Sasha Fierce for an alter ego during the era of her 2008 album I Am... Sasha Fierce.

She described Sasha Fierce as a more aggressive, confident stage persona, distinct from her private self. The album’s two-disc structure reflected that idea: I Am contained more personal ballads, while Sasha Fierce emphasized uptempo performances and dance-oriented material.

The album included major singles such as “If I Were a Boy,” “Halo,” “Single Ladies (Put a Ring on It),” and “Diva.” The alter ego became especially associated with Beyoncé’s stage presence, choreography, and performance intensity.

Sasha Fierce was not Beyoncé’s legal name, a separate singer, or the title of a band. Beyoncé later said she no longer needed to separate that persona from herself, describing the character as something she had integrated into her artistry.